The question is, does that pop up when you try to connect a USB device? Do you get that when you try to install the dongle? (That shouldn't happen). If you are trying to connect a PDA or cell phone, you setup the passkey for the connecting device on the computer then type it in to the PDA or mobile phone. If you are trying to connect a bluetooth headset, then you use whatever code is from the manufactorer. Normally this is 0000 or 9999.

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Headphones are a convenient way to experience
audio-rich entertainment on your own terms. Headphones allow you to customize
your listening level without disturbing other people in your general vicinity.
Headphone cables can be a hassle, however, so
many new headphone models feature a wireless connection.
PCs tend to be wire jungles, so eliminating one
wire from a potentially jumbled mess can be an intriguing feature of wireless
headphones.
Connecting wireless headphones to your PC allows
you to take advantage of the benefits of listening to your movies, music or
games through headphones without the struggle of the headphone cable.
Charge up or place batteries in your headphones and
transmitter.
Wireless headphones require power to function.
Many wireless headphones come with a charger base.
You need to charge your headphones before you attempt to
connect them to your PC.
Some wireless headphone models require batteries, which you
must install before you connect the headphones to the PC.
Connect the transmitter to your PC.
The transmitter may connect via the PC's headphone jack or
USB port.
If the transmitter connects to the headphone jack, plug it
in and check your headphone's user guide to verify how to synchronize the
headphones to the transmitter.
If the transmitter connects via USB, you will likely need to
install software to use your wireless headphones.
If your wireless headphones are Bluetooth-compatible,
continue to the next step.
Pair your headphones via Bluetooth to your PC.
If your PC is not Bluetooth-equipped, you will need to
install a Bluetooth USB dongle.
Turn on your headphones and open the Bluetooth software on
your PC.
Scan for Bluetooth devices from your PC.
Your headphones should appear.
Select the headphones and follow any further instructions to
complete the pairing process.
Test the headphones.
Pick out a song or a video and play it on your PC.
Connect your wireless headphones and verify that you can
hear the audio.
Find the volume controls on your headphones and adjust them
to make sure the volume changes correctly.
If your headphones are not functioning properly, verify that
the headphones are turned on.
If the headphones are on and you do not hear anything,
verify that your transmitter is functioning properly and that you have your
volume turned up on your PC.
Recharge your headphones when you are finished using them.
To ensure that the headphones are ready anytime you need
them, you must always place them on the charging base when you are finished
using them.
If the headphones are battery-powered, be sure
that you always have spare batteries on hand.

Have you installed the necessary drivers for the wireless adapters? If yes, please check in the Network Connections if the wireless connection is enabled or disabled. Also, check if there are other programs using the wireless connection like Realtek Wireless LAN Utility.

This device, according to the Jabra website, is intended only for phones, not PC's. The PC is searching for a driver in order to know how to communicate with the device. Since the VBT2050 does not have the necessary software contained within itself, the PC starts searching for device drivers. There are none that I could find on the Jabra website, so I don't think it is intended to be used with a PC.

Most acer laptops have the bluetooth front button but very few have it installed.
No device means yours is not bluetooth enabled and you will have to purchase a usb bluetooth adapter, class 1 being a 10 metre distance connection, class 2 being a 30 metre connection distance.